Object reference not set to an instance of an object - Message Box

[andres.enriquez]

Hello everyone, I have an issue with the following error:

“Object reference not set to an instance of an object”

Context: I am just trying to use a simple activity “message box” and I am unable to use it, as per the other activities, this error persist in every other activities, that results in not being able to use UiPath at all.
I am not using any variables.

I show you the error and the context:

It is very frustrating, there is no way I can use a simple activity.

Any ideas?

[Palaniyappan (Palaniyappan P)]

Hmm
Fine
Can u create a new project and try the same again
Let’s see whether this is getting repeated

Cheers @andres.enriquez

[andres.enriquez]

Hi Palaniyappan, thanks for the quick reply.

Look, I created a new project, and I discovered a weird behaviour:

When I use the “main.xaml” file, and execute it, it works…
When I create any other sequence or workflow it fails, then it shows up the “Object reference not set to an instance of an object” error.

[ppr (Peter Preuss)]

give a try on downgrading the following packages to lower version e.g. 22.10.X level

[andres.enriquez]

I tried different versions, the error persist

[ppr (Peter Preuss)]

please repeat the step on a new fresh project including UiPath Studio close and reopening.

When the issue persists also share with us the

• UiPath Studio Version
• Error log / message

So it can be decided if

• a issue replication or
• feedback to the technical team

is to do as one of the next actions

[Palaniyappan (Palaniyappan P)]

Hi

Is any other property of message box is filled with a variable that doesn’t have any value
Check that once

Cheers @andres.enriquez

[andres.enriquez]

Hi Peter, I share with you those details:

Version

error log:
Error: UiPath.WorkflowProcessor.Common.Exceptions.UiPathLocalizedException: Object reference not set to an instance of an object.
at UiPath.WorkflowProcessor.Common.Preprocessing.WorkflowDocumentPreprocessor.GetDependencyTree(LoggingScope scope, String xamlFilePath, IDictionary2 codeSourceFiles) at UiPath.Studio.ProjectCompiler.Services.ProjectCompilerService.<>c__DisplayClass9_0.<CalculateCompilationDependencies>b__1(String wf) at System.Linq.Enumerable.SelectEnumerableIterator2.MoveNext()
at System.Linq.Enumerable.SelectManySingleSelectorIterator2.MoveNext() at System.Linq.Enumerable.DistinctIterator1.MoveNext()
at System.Linq.Enumerable.WhereEnumerableIterator1.ToArray() at UiPath.Studio.Plugin.Workflow.Execution.Services.ExecutionCompilationService.CompileInternal(Boolean calculateWorkflowDependencies) at UiPath.Studio.Plugin.Workflow.Execution.Services.ExecutionCompilationService.Compile(String entryWorkflow) at UiPath.Studio.Plugin.Workflow.Execution.Services.ExecutionStartConfigurator.ConfigureAsync(Boolean firstExecutionInBatch, Boolean lastExecutionInBatch, IEnumerable1 batchedDocuments, String entryWorkflow)
at UiPath.Studio.Plugin.Workflow.Execution.Services.WorkflowExecutor.StartExecution(ExecutionConfig config)
at UiPath.Studio.Shell.Execution.Services.ExecutionManagerBaseService.TryStartExecution(ExecutionConfig executionConfig, Boolean validate)
at UiPath.Studio.Shell.Execution.Services.ExecutionManagerService.<>c__DisplayClass27_0.<g__StartExecutionAsync|1>d.MoveNext()
— End of stack trace from previous location —
at UiPath.Studio.Shell.Execution.Services.ExecutionManagerService.ProcessExecutionCommand(ExecutionCommand command, Object item, ExecutionParameters executionParameters)
at UiPath.Studio.Shell.ViewModels.DebugTabViewModel.ExecuteRunProjectAsync()
at UiPath.Studio.App.Desktop.MVVM.Commands.TaskCommand`3.Execute(TExecuteParameter parameter, Boolean ignoreCanExecuteCheck)
at System.Threading.Tasks.Task.<>c.b__128_0(Object state)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler), HResult -2146233088

[andres.enriquez]

Oh no, there are no variables at all, just a string type in the message box.

[ppr (Peter Preuss)]

@andres.enriquez

UiPath.WorkflowProcessor.Common.Exceptions.UiPathLocalizedException

Can you shift the UiPath Languague to English and repeat the tests?

[andres.enriquez]

I changed the language:

[ppr (Peter Preuss)]

not the same (as not Community version) but a little bit similar

[SOLVED] Object reference not set to an instance of an object - New Proyect

Hi, I have a problem when I create a new Process project. When it is created, the main.xaml file appears in the structure from where I have made several executions previously. But now I want to add a new process (Ctrl + N) inside the folder but when I try to execute anything (even just a Log Message) it shows the error of: Object reference not set to an instance of an object. This stays even if I create a flowchart, form or any new window. From the folder panel I set the new process as main …

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